These steps should be used to modify the DLM, DLL registers of an UART channel:
1. Write 0x80 to the LCR register of the UART channel (enable access to the DLM, DLL registers).
2. Program the DLM, DLL registers of the UART channel.
3. Write normal operation byte value to the LCR register of the UART channel.
These steps should be used to modify MCR register bit 7 of an UART channel (set baud rate
generator prescaler):
1. Set UART channel EFR register bit 4 to '1' (enable modification of MCR register bits 5-7).
2. Modify UART channel MCR register bit 7.
3. Set UART channel EFR register bit 4 to '0' (latch modified MCR register setting).
Note that the maximum baud rate for RS232 channel is 921.6 kps. Thus the minimum divisor
value for RS232 channels is 0x0003 with MCR[7] = 0.
TPMC467 User Manual Issue 1.0.4
Page 28 of 30
